An obnoxious contraction of "inertia" and "initiative". Together, they combine to mean 'taking the lead in doing the same thing we were doing before'.
Matt wants to get some dinner, but Brian took the inertiative and hasn't moved from the couch.
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Politically correct way to say "fat"
There's no way she'll get her inertially challenged ass into those jeans.
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1. To motivate a person or group such that they actually take action.
2. To create inertia in a person or group.
3. To kick someone in the pants -- successfully.
Ex 1: "No one wants to be the first person to buy tickets for this event. Looks like I'm going to have to inertialize."